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Patent US3438618A successfully refreshed from Google Patents.
US3438618A
Expired / Lapsed
US
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Vacuum heat treating furnace
Assignee: Abar Ipsen Industries Inc
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Filing: 1966-09-08
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Granted: 1969-04-15
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Expires: 1986-09-08
Abstract
No abstract record available.
Inventors
- 👤 Karl H Seelandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:12
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/74; C21D1/773
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1706010A
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US2568653A
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US2756032A
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US3033547A
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US2987788A
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US3197975A
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US3185460A
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FR1391240A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |